Question

A half-life is the amount of time it takes for a substance or entity to fall to half its original value. Caffeine has a half-life of about 6 hours in humans. Given caffeine amount (in mg) as input, output the caffeine level after 6, 12, and 24 hours. Output each floating-point value with two digits after the decimal point, which can be achieved by executing cout << fixed << setprecision(2); once before all other cout statements.

Answer 1

Answer:

#include <iostream>

#include<iomanip>

using namespace std;

int main()

{

double caffeineMg;

cin>>caffeineMg;

cout<<"After 6 hours: "<<fixed<<setprecision(2)<<caffeineMg/2.0<<" mg\n";

cout<<"After 12 hours: "<<fixed<<setprecision(2)<<caffeineMg/4.0<<" mg\n";

cout<<"After 24 hours: "<<fixed<<setprecision(2)<<caffeineMg/8.0<<" mg\n";

 

return 0;

}

Explanation:

• Take the caffeine as input from user.
• Calculate by dividing this value with relevant half life.
• Use setprecision(2) to display 2 digits after decimal point.